Chest Location
In this Sea of Stars guide, you'll find the locations of all the chests to be opened during Part 18: Mirth.
When you complete Part 17: Maelström Point, you can explore the city of Mirth and the ancient crypt to find several blue chests. Find them all to collect rainbow conches.
Chests to find
Blue Chest #1 - To the right of the Old Crypt entrance
Head north to reach the ancient crypt. Here you'll meet the Marchecrypte, who stands in front of the crypt. Quite simply, this is a place in the game that commemorates the contributors and creators of the game! Save your game and open the blue chest hidden at the entrance to the crypt to receive a Rainbow Conch.
Blue Chest #2 - To the right of the little house at the top of the tavern
There's another blue chest hidden at the top of the tavern just to the left of the game save book. Enter the tavern and climb the stairs at the back of the room, exiting onto the balcony. At the back of the little house above, you'll find another blue chest hidden on the right. Open the chest to receive a Rainbow Conch.